scholarly journals A Quantitative Method to Examine Through Thickness Texture Variation

1993 ◽  
Vol 21 (2-3) ◽  
pp. 109-120 ◽  
Author(s):  
S. Saimoto ◽  
R. G. Kamat ◽  
P. Clarke ◽  
P. van Houte
Keyword(s):  
Quantitative Method ◽  
Transverse Direction ◽  
Rolling Texture ◽  
Orthorhombic Symmetry ◽  
Monoclinic Symmetry ◽  
Peak Intensity ◽  
Pole Figures ◽  
Commercial Aluminium ◽  
Hot Rolled ◽  
Commercial Sheet

Through thickness texture variation is a reality in commercial sheet stock. However, methods to quantitatively evaluate this variation and its effects are not readily available. In this study, it was shown that a hot rolled commercial aluminium sheet manifests variation in rolling texture components which can be detected by traverse scan of the peak intensity across the through thickness using tapered specimens. Moreover, this asymmetry can be correlated to the intensity asymmetry observed in pole figures. A quantitative analysis is possible if the ODF is generated using monoclinic symmetry with the transverse direction as the diad axis instead of the conventional orthorhombic symmetry.

scholarly journals The Texture of a Slate From Nantlle, Caernarvon, North Wales

Texture ◽  
1972 ◽  
Vol 1 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Gerhard Oertel ◽  
Prem P. Phakey
Keyword(s):  
Ultrathin Section ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Plane Normal ◽  
North Wales ◽  
Pole Figures ◽  
Sheet Silicate ◽  
Diffraction Patterns ◽  
Local Dissolution ◽  
Mechanical Rotation

A specimen of Cambrian slate from the slate belt in North Wales has been thinned by the ion bombardment technique to produce an ultrathin section with the specimen plane normal to the cleavage plane. This specimen has been investigated with the electron microscope by electron transmission. Selected area diffraction patterns allow identification of individual sheet silicate grains. The pole figures of the basal planes of two sheet silicate minerals, muscovite and chlorite, have been measured with an X-ray pole-figure goniometer and both show an elongated maximum normal to the slaty cleavage, with orthorhombic symmetry. While the preferred orientation could be the result of mechanical rotation of rigid flakes in a deforming matrix, the texture (the overall pattern due to the shapes and sizes of grains and their angular relations to each other) can only be explained if considerable recrystallization is assumed. It is tentatively proposed that local dissolution at points of stress-concentration with simultaneous redeposition of the dissolved material in less stressed regions may have allowed closely packed grains to act as if they were mechanically rotating rigid flakes, yet to accommodate their shapes enough to prevent interlocking.

scholarly journals Approximation of the Orientation Distribution of Grains in Polycrystalline Samples by Means of Gaussians

1992 ◽  
Vol 19 (1-2) ◽  
pp. 9-27 ◽  
Author(s):  
D. I. Nikolayev ◽  
T. I. Savyolova ◽  
K. Feldmann
Keyword(s):  
Rolling Texture ◽  
Expansion Method ◽  
Operating Mode ◽  
Orientation Distribution ◽  
New Method ◽  
Gaussian Distributions ◽  
Positivity Condition ◽  
The Central Limit Theorem ◽  
Pole Figures ◽  
Series Expansion Method

The orientation distribution function (ODF) obtained by classical spherical harmonics analysis may be falsified by ghost influences as well as series truncation effects. The ghosts are a consequence of the inversion symmetry of experimental pole figures which leads to the loss of information on the “odd” part of ODF.In the present paper a new method for ODF reproduction is proposed. It is based on the superposition of Gaussian distributions satisfying the central limit theorem in the SO(3)-space as well as the ODF positivity condition. The kind of ODF determination offered here is restricted to the fit of Gaussian parameters and weights with respect to the experimental pole figures. The operating mode of the new method is demonstrated for a rolling texture of copper. The results are compared with the corresponding ones obtained by the series expansion method.

On the Longtime Stability of a Copper Rolling Texture Analysed by Neutron Diffraction Pole Figures

1998 ◽  
Vol 278-281 ◽  
pp. 502-507
Author(s):  
E. Jansen ◽  
Wolfgang Schäfer ◽  
A. Kirfel ◽  
J. Palacios
Keyword(s):  
Neutron Diffraction ◽  
Rolling Texture ◽  
Pole Figures

Annealing effects in commercial aluminium hot-rolled 7075(–Sc–Zr) alloys

2020 ◽  
Vol 142 (5) ◽  
pp. 1613-1623 ◽  
Author(s):  
Veronika Kodetová ◽  
Martin Vlach ◽  
Hana Kudrnová ◽  
Michal Leibner ◽  
Jaroslav Málek ◽  
...  
Keyword(s):  
Annealing Effects ◽  
Commercial Aluminium ◽  
Hot Rolled ◽  
Zr Alloys

scholarly journals A Note on the Rolling Texture of Nickel-Iron-Niobium Alloy

1981 ◽  
Vol 4 (3) ◽  
pp. 153-157 ◽  
Author(s):  
L. C. Tai ◽  
Zen-Jue Tan
Keyword(s):  
Rolling Texture ◽  
Niobium Alloy ◽  
Cold Reduction ◽  
X Ray ◽  
Nickel Iron ◽  
Mechanical Hardness ◽  
Pole Figures ◽  
The Difference

The nickel-iron-niobium alloy containing about 79% Ni, 8% Nb and 13% Fe in sheet form has been prepared and fabricated. The rolling texture of the alloy after cold reduction of 50 and 94% has been determined by using X-ray counter diffractometer and the results are presented in pole figures. In comparison with Ni-Fe-Mo, the results are discussed from a view of the difference of mechanical hardness between these two categories of alloys.

Neutron Diffraction Texture Analysis of Grain-Oriented Steel Sheets

2005 ◽  
Vol 105 ◽  
pp. 175-180 ◽  
Author(s):  
Stanislav Vratislav ◽  
Maja Dlouhá ◽  
Ladislav Kalvoda
Keyword(s):  
Neutron Diffraction ◽  
Cold Rolling ◽  
Texture Analysis ◽  
Volume Fraction ◽  
Rolling Direction ◽  
Orthorhombic Symmetry ◽  
Automatic Data ◽  
Cubic Symmetry ◽  
Steel Sheets ◽  
Pole Figures

Our laboratory developed and tested experimental and calculation techniques for quantitative texture analysis based on the ODF combined with the diffraction of thermal neutrons. In our work the texture of the Fe-3%Si sheets was investigated after different stages of their processing, i.e. hot-rolled strips, first cold rolling, first inter-annealing, second cold rolling, second annealing and secondary recrystallisation. The texture experiments were carried out on the KSN-2 diffractometer which is equipped with the TG-1 texture goniometer with automatic data collection for transmission and reflection geometry. TODFND (the cubic symmetry of the crystals and orthorhombic symmetry of the specimen) was used and the ODF values were obtained together with all texture characteristics (pole figures, inverse pole figures, ODF - f (g) values, fibre texture with <110> and <001> axis parallel to rolling direction, parameters of the ideal orientations (HKL)<uvw>, texture index J, volume fraction coefficient f. The comparison of the texture parameters of the six samples with the different technologic history is given and the magnetic anisotropy of all measured samples was determined by means of the quantitative texture analysis (ODF-the matrix Cl nµ) for all samples. Results achieved in our study confirm that the quantitative texture analysis in connection with neutron diffraction can help to improve the technology of the preparation of oriented magnetic steel sheets.

Zur Synthese und Kristallstruktur von manganhaltigen Boratoxiden: MnFe(BO3)O und MnAl0,5Yo,5(BO3)O / Synthesis and Crystal Structure of Manganese Borate Oxides: MnFe(BO3)O and MnAl0,5Yo,5(BO3)O

1995 ◽  
Vol 50 (8) ◽  
pp. 1146-1150 ◽  
Author(s):  
Anne Utzolino ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
Metal Ions ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Monoclinic Symmetry ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of the compounds MnFe(BO3)O (I) and MnAl0.5Y0.5(BO3)O (II), were obtained by a B2O3 flux technique. I crystallizes with orthorhombic symmetry, space group D162h -Pnma (Nr.62), a = 939.92; b = 319.41; c = 939.11 pm; Z = 4 and II with monoclinic symmetry, space group C52h-P21/n (Nr. 14). a = 325.6; b = 955.1; c = 929.2 pm; β = 90.70° ; Z = 4. I is isotypic to the mineral Warwickite, while II is a distorded variant of this structure. All metal ions are octahedrally coordinated. Both structures contain isolated, trigonal planar BO3 units and oxygen atoms that are not coordinated to boron.

Application of Recrystallization Texture Evolution Model to Predict Plastic Formability in Steel Strips

2014 ◽  
Vol 783-786 ◽  
pp. 1954-1960
Author(s):  
Toshiharu Morimoto ◽  
Y. Fuyuki ◽  
A. Yanagida ◽  
Jun Yanagimoto
Keyword(s):  
Recrystallization Texture ◽  
Texture Evolution ◽  
Steel Strip ◽  
Rolling Texture ◽  
Interstitial Free ◽  
If Steel ◽  
Taylor Model ◽  
Steel Strips ◽  
Cold Rolled ◽  
Hot Rolled

T.M.C.P.(Thermo Mechanical Control Processing) has been widely used to improveplastic formability in steel strips. We have produced interstitial free steel(IF steel) strips and ferriticstainless-steel strips through T.M.C.P. rolling method. Optimizing conditions of hot rolling, hotrolled annealing, cold rolling and cold rolled annealing, we developed texture prediction model. Wecan predict rolling texture accurately using the conventional Taylor model. Moreover, we preciselypredict recrystallization texture classifying the total number of microscopic􀀁 slips which arecalculated using the Taylor model. We consider that these calculated results provednucleation-oriented model and two types of recrystallization and grain growth mechanisms exit inour studies. One mechanism is that grains which had the small total number of microscopic slips arepreferred orientation for the hot rolled and annealed ferritic stainless-steel strip. The othermechanism is that grains which had the high total number of microscopic slips are preferredorientation for the cold rolled and annealed IF steel strip.

scholarly journals Effect of Hot Band on Texture Evolution and Plastic Anisotropy in Aluminium Alloys

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1310
Author(s):  
Jurij J. Sidor
Keyword(s):  
Thermomechanical Processing ◽  
Texture Evolution ◽  
Plastic Anisotropy ◽  
Great Influence ◽  
Rolling Texture ◽  
Direct Consequence ◽  
Qualitative And Quantitative ◽  
Texture Characteristics ◽  
Hot Band ◽  
Hot Rolled

This contribution presents the evolution of crystallographic texture during thermomechanical processing of Al alloys. It is shown that the nature of crystallographic changes involved in deformation and recrystallization is strongly affected by the variety of initial (pre-rolling) state of a given metallic system. Four hot rolled Al strips of identical chemical composition and different textures were subjected to further thermomechanical processing with equal technological characteristics. Although the pre-rolling textures were first destroyed by the deformation, while annealing accounted for further qualitative and quantitative crystallographic changes in the investigated polycrystalline systems, it seems that there is still a great influence of the hot band texture on the texture dependent properties. Various qualitative and quantitative texture characteristics of annealed sheets ensured diverse Lanford value curves, which is a direct consequence of the crystallographic features developed in the hot bands. The Cube-dominated hot band ensured a strong V-shaped profile after cold rolling and subsequent recrystallization, whereas it was shown that a weak pre-rolling texture is more advantageous in terms of both normal and planar anisotropy.

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